Knockdown scaffold



March 26, 1935. c; s. CLARK 1,995,668

KNOCKDOWN SCAFFOLD Filed se'pi, 24, 1934 a sheets-sheet 1 .67@7'622 ce 5.67am",

26, 193,5. l Q CLARK 1,995,668

KNOGKDOWN SCAFFOLD Filed Sept. 24, 1934 3 Sheets-Sheet 2 Inventor ,67a ma a@ wmf/f,

March v Q s. CLARK KNOCKDOWN SGAFFOLD Filed sept. 24, 1934 .3 Sheets-sheet s Inventar Attorney' passed 2,6, n35v 1,995,663 f UNITED STATES PATENT OFFICE KNOCKDOWN SCAFFOLD n Clarence Santee Clark, Wilmington, Ill.

Application September 24, 1934, Serial No. 745,333

5 Claims. (Cl. 304-40) `This invention relates to an improved scaffold brackets employed as timber connecting or jointof a portable knockdown type susceptible of exing units.A peditious and reliable usage by Workmen such Referring now to Figures 1 and 2, it will be obas carpenters, plasterers, painters, and the like. served that the vertical uprights, generally 5 The invention has to do with a structure which wooden beams, are denoted by the numerals d 5 is capable of use in building and construction These are of appropriate proportions for easy Work either on the interior or exterior as con transportation and handling. 'I'hey must, of ditions may require. It has been conceived and necessity, be suiiieiently sturdy t promete reduced to practice with a view toward providing strength and durability. These posts or uprightsV 10 the user with a scientifically and uniformly balare assembled into an open framework which 10 anced supportsuch aswill obviate the necessity of forms the trestle and this framework includes building ascafrold on the job from makeshift horizontalsupporting rails 7 for the planks or and unreliable materials. boards 8 and connecting timbers 9 and 10. 'I'he In carrying the principles of the invention into timbers 9 may be designated as the longitudinal l actual practice, I have evolved and produced a spaed parallel frame members while those de- 15 structural arrangement which is characterized by noted by the numerals 10 may, fOr the sake 0f well directed and appropriate structural features distinction. be differentiated as the Cross pieces Y of a noteworthy type, the complete structure 01 transverse frame members. All of the tirnbeing such as to fu1n11 the expectations of the bers '1, 9 and 10 are preferably of uniform type workmen in a highly practicable and satisfactory so as t0 be interchangeable for Satisfactory 'CO- 20 mannen Y operation with the jointing units or brackets, that In addition to providing a structure which is is, the devices which serve to connect the timbers simple and economical, I have eve1ved and pm.A with the posts. In order to insure balance and duced an arrangement, which can be expeditiousuniformity of distribution of stress and strain, it

ly erected and thereafter dismantled and proper- Will be Observed that the 10Wer rails 0r timbers 9 25 ly adjusted with facility for me purpose, of ele.. are disposed on an elevation below the timbers vating or lowering the planks or platforms as 10. the timbers 10 being at right angles to the the case may be, timbers 9 `and suilicient to assemble and maintain An outstanding feature of the preferred emthe uprights in appropriate frame formingrelabodiment of the invention is the bracket or tien t0 satisfactorily ,support the top rails 0r 30 brackets expressly designedto serve as an apframe members 7. Incidentally, as will be evipropriate expediency te prompt and ready grecdent from thefollowing claims, the terms timtion, and to make for portability in order to facilibers" arid frame members are used alternativetate transportation from place to place for de- 1y in an equivalent sense to designate any one or ,pendable usage. y Y all of the parts '1, 9, and 10. Y 35 other features and advantages will become Although the brackets or devices illustrated in more readily apparent from the following descrip- Figures 3 and 4 are. Substantially the Same,v they tien and drawing-s, are, for the sake of distinction, differentiated by In the drawings; the numerals 11 and 12, respectively. The brack- Figure 1 is a fragmentary side elevational view et 12 may be Sad t0 be 0f the Single brace type 40 -of the complete scaffold illustrating the trestle, "while the bracket 11 may be distinguished as the the walking plank, and the various fixtures or duplex brace type. The brackets 11 are used for brackets utilized for rendering the assemblage connecting the cross pieces or frame members 10 satisfactorily operable. Y y with the uprights; Basically, however, these Figure 2`is a topplan view of the arrangement brackets are somewhat the same in construction; 45 depi'ctedin Figure 1 with. the plank or board rethat is to say, each bracket is constructed of sheet moved. Y metal and fashioned to provide a rectangular Figures 3, 4 and 5 are detail perspective views box-like socket or receptacle 13 having holes 14 illustrating the features or parts employed in to accommodate fasteners such as bolts, nails or 50 the construction ofthe timber jointing devices the like. In addition the side walls of-these re- 50 or brackets. A 4 ceptacles are formed with extensions or anges 15 In Figures land 2 I haveillustrated the parts disposed in spaced parallelism to embrace the' utinzed for constructing me complete knockadjacent or. complemental timber. The flanges down portable scaiold. In Figures 3 to 5 I have employed in the type of brackets denoted by the disclosed the distinguishable embodiments of numeral 11 are oiset or of right angular forma- 55v tion to engage over the posts as illustrated in Figure 2. The receptacles are formed with reinforcing ribs 16 and these ribs terminate in studs 17 whose outer ends are screw threaded as at 18.

AThe threaded studs are adapted` to extend through apertures 19 formed in a clamping plate 20. This clamping plate is provided with a pointed spur 21 which is adapted to be embedded in the wood of the timber to facilitate placement and maintain anchorage. The clamping plates, which slip over` the studs 17 are held against the adjacent 'timbers by way of wing nuts 22. In the single brace type bracket shown in Figurev 4, I provide a. right angularly disposed abutment 23 joined integrally to the receptacle 13 by a connective web 24. 'I'hese features 23 and 24 provide a suitable brace which rests against the posts for effective maintenance and rigidity. 'Ihese features 23 and .24 may be referred to collectively as stabilizing means. In the bracket 11 shown in Figure 3 I provide upper and lower stabilizing members or means while in the bracket 12 shown in Figure 4 I provide a single stabilizer. Generically then, each bracket or coupling device comprises a receptacle 13 to accommodate the adjacent end of the rail or frame member, this being provided with clamping flanges 15 carrying nut accommodating studs cooperable with clamping plates 20. In addition, each bracket embodies at least one stabilizing member comprising a suitably arranged properly proportioned abutment 23 and the connective web 24. Hence, with these sets of brackets, it is possible to expeditioustion claimed may be resorted to in actual practice,

if desired.

What is claimed is: A

1. A coupling bracket for use in the construction of a scaffold of the class described comprising a receptacle adapted to receive one end' of a timber, the side walls of said receptacle being extended in parallelism to provide-post embracing and clamping iianges, said anges being provided with screw-threaded connecting studs, and an apertured clamping plate eooperable with said studs, together with retaining nuts adapted to be mounted on said studs for holding the plate in position.

l 2. A timber attaching and adjusting bracket of the class described comprising a sheet metal Therefore, a more lengthy description .the class described comprising a sheet metal structure including a receptacle portion for reception of one end of the timber, the sides of said receptacle portion being formed with extension flang to embrace a post, said flanges being provided with screw threaded retaining studs, a stabilizlng member carried by said receptacle and including a depending abutment to rest against' saidA post, a bracing web between the abutment and bottom of said receptacle, and a detachable clamping plate adapted for association with said studs, said plate having apertures to accommodate the studsand being formed intermediate its ends with a pointed spur designed to embed itself in the complemental post.

4. As a new article of manufacture, a component part of a coupling bracket of the type described comprising a receptacle adapted for horizontal disposition, said receptacle being of rectangular cross sectional shape and including spaced parallel side walls and adjoining top and bottom walls, said receptacle being adapted to receive one end of a timber, the side walls of said receptacle being formed at their outer ends with extended portions constituting post embracing and clamping flanges, and the free end portions of said flanges being provided with means to facilitate adjustable connection of said flanges with the complemental post,' and a depending brace unit attached to the bottom of said receptacle and including a portion adapted to bear against the aforesaid post.

5. A timber attaching and adjusting bracket of the type described comprising a substantially rectangular box-like receptacle adapted for reception of one end of a timber, said receptacle being open at its opposite ends, and including spaced parallel side walls and adjoining top and bottom walls, the rear ends oi the side walls being formed into extended ilanges to embrace the adjacent post, means carried by said flanges to facilitate attachment thereof with the post, and upper and lowe'r stabilizing and bracing members, said members being connected with the top and bottom walls of the receptacle in an integral manner and each member including a vertical abutment to bear against the adjacent post, and a connecting web betweenssaid abutment and companion wall of the receptacle.

CLARENCE SANTEE CLARK. 

